Accounts Receivable (Tables)

12 Months Ended

Dec. 31, 2019

Accounts Receivable

Schedule of components of accounts receivables

December 31,	2019		2018
(in thousands)
Trade receivables:
Billed	$	191,579	$	266,660
Unbilled		52,052		56,408
Other receivables		4,124		5,278
Total		247,755		328,346
Less: allowance for doubtful accounts		(5,181)		(4,813)
Accounts receivable, net	$	242,574	$	323,533

Schedule of changes in allowance for doubtful accounts

Years Ended December 31,	2019		2018
(in thousands)
Beginning balance	$	4,813	$	4,471
Bad debt expense		1,481		588
Accounts written-off		(1,142)		(260)
Recoveries		29		14
Ending balance	$	5,181	$	4,813